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Q: No Sound from Radio on 2004 BMW X3

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The radio is on, volume knob is adjusted. Fuses have been checked, re-checked and replaced. Fuse in AMP has been replaced, not blown, but what the heck. I am at my wits end with this thing!!!!
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YOU SAY THE FUSE IN THE AMP IS GOOD? iS IT GETTING POWER TO IT? WHAT OTHER SYMPTOMS BEFORE SPEAKERS WENT OUT?
Yes the fuse is good. No corrosion on the connectors. My daughter said she put a cd in and it started to play then the sound started to flutter in and out, then the sound was gone.
My question still wasn't answered--if the fuse is good IS THE AMP GETTING POWER AND INPUT FROM AUDIO UNIT & HOW ARE YOU TESTING IT???????oR JUST BRING IT TO A STERO SHOP AND BE DONE WITH IT.
The fuse to the amp is good. I honestly have no idea if it is good. The music was working fine...then started to cut out...then went dead. The dash unit seems to operate normally. The stations work, the cd will take and spin. Its just that there is no sound out of the system in any mode. All I can do in terms of testing is verify the fuses.
Can you get your hands on a voltmeter to check for battery voltage at amp? Is there any kind of LED on it indicating that it's on?
Had exact problem for over two years. Tried new head unit, amp, no luck. BMW wants to put a new system in for $2500... Power to head unit, power to amp, no sound... Any suggestions would be greatly appreciated.
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